An in situ reduction approach for bio-oil hydroprocessing

Xiong, Wan-Ming; Fu, Yao; Zeng, Fanxin; Guo, Qi

doi:10.1016/j.fuproc.2011.04.005

Cited by 56 publications

(29 citation statements)

References 35 publications

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“…This direct hydrodeoxygenation yielded only 23 wt % upgraded oil and resulted in severe coke deposition and bed plugging [43]. Xiong et al also tested direct HDO of bio-oil using a Raney Ni catalyst in a batch reactor, leading to low yield of organic liquid [44]. Therefore, in order to overcome the obstacles mentioned above, alternatives such as employing a two-stage process and co-feeding with solvents were investigated for bio-oil hydrotreatment.…”

Section: Hdo Of Actual Pyrolysis Oilmentioning

confidence: 99%

“…During the upgrading process, formic acid decomposed to produce hydrogen while by-product CO 2 dissolved in solvents improving the rate of hydrogenation. High yield of liquid phase (>86%) and slight coke formation (<5%) were achieved with partial hydrogenation that alkenyl and aldehyde groups were almost completely reduced [44]. Xu et al used methanol as hydrogen donor instead of hydrogen gas in the hydrogenation of bio-oil at 493 K and 30 bar.…”

Section: In-situ Hydrogenationmentioning

confidence: 99%

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An Overview on Catalytic Hydrodeoxygenation of Pyrolysis Oil and Its Model Compounds

et al. 2017

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Abstract:Pyrolysis is considered the most promising way to convert biomass to fuels. Upgrading biomass pyrolysis oil is essential to produce high quality hydrocarbon fuels. Upgrading technologies have been developed for decades, and this review focuses on the hydrodeoxygenation (HDO). In order to declare the need for upgrading, properties of pyrolysis oil are firstly analyzed, and potential analysis methods including some novel methods are proposed. The high oxygen content of bio-oil leads to its undesirable properties, such as chemical instability and a strong tendency to re-polymerize. Acidity, low heating value, high viscosity and water content are not conductive to making bio-oils useful as fuels. Therefore, fast pyrolysis oils should be refined before producing deoxygenated products. After the analysis of pyrolysis oil, the HDO process is reviewed in detail. The HDO of model compounds including phenolics monomers, dimers, furans, carboxylic acids and carbohydrates is summarized to obtain sufficient information in understanding HDO reaction networks and mechanisms. Meanwhile, investigations of model compounds also make sense for screening and designing HDO catalysts. Then, we review the HDO of actual pyrolysis oil with different methods including two-stage treatment, co-feeding solvents and in-situ hydrogenation. The relative merits of each method are also expounded. Finally, HDO catalysts are reviewed in order of time. After the summarization of petroleum derived sulfured catalysts and noble metal catalysts, transitional metal carbide, nitride and phosphide materials are summarized as the new trend for their low cost and high stability. After major progress is reviewed, main problems are summarized and possible solutions are raised.

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Section: Hdo Of Actual Pyrolysis Oilmentioning

confidence: 99%

Section: In-situ Hydrogenationmentioning

confidence: 99%

An Overview on Catalytic Hydrodeoxygenation of Pyrolysis Oil and Its Model Compounds

et al. 2017

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“…Xiong et al [59] studied obtaining hydrogen from formic acid over Ni, Pd, and Ru on various supports in a batch reactor at 40 bar, a temperature of 150-230 °C, and a reaction time of 5-7 h. The catalyst supports did not make a significant difference, but Ni and Ru outperformed Pd in final product quality. Oxygen content was lowered while a reduction in the unsaturated components was observed, along with the conversion of organic acids into esters.…”

Section: Hydrodeoxygenationmentioning

confidence: 99%

Catalytic Fast Pyrolysis: A Review

2013

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Catalytic pyrolysis is a promising thermochemical conversion route for lignocellulosic biomass that produces chemicals and fuels compatible with current, petrochemical infrastructure. Catalytic modifications to pyrolysis bio-oils are geared towards the elimination and substitution of oxygen and oxygen-containing functionalities in addition to increasing the hydrogen to carbon ratio of the final products. Recent progress has focused on both hydrodeoxygenation and hydrogenation of bio-oil using a variety of metal catalysts and the production of aromatics from bio-oil using cracking zeolites. Research is currently focused on developing multi-functional catalysts used in situ that benefit from the advantages of both hydrodeoxygenation and zeolite cracking. Development of robust, highly selective catalysts will help achieve the goal of producing drop-in fuels and petrochemical commodities from wood and other lignocellulosic biomass streams. The current paper will examine these developments by means of a review of existing literature.

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“…For example, as a catalyst, ZnO advances the bio‐oil characteristics in units of low molecular mass compounds . Studies in literature, with the use of Ni, Pd, and Ru metal catalysts under high pressure, the conversion of organic acids to esters resulted in a decrease in unsaturated components, while the oxygen content was reduced . A metal oxide catalyst was also used in this study.…”

Section: Introductionmentioning

confidence: 99%

“…27 Studies in literature, with the use of Ni, Pd, and Ru metal catalysts under high pressure, the conversion of organic acids to esters resulted in a decrease in unsaturated components, while the oxygen content was reduced. 28 A metal oxide catalyst was also used in this study. The aim of our study is to transform waste biomass into energy-rich liquid products and at the same time to examine and compare the conversion efficiencies of liquid, solid, and gaseous products.…”

Section: Introductionmentioning

confidence: 99%

Comparison of catalytic and noncatalytic pyrolysis and product yields of some waste biomass species

2019

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Summary The products obtained by fast pyrolysis of biomass can be used as an energy source or chemical raw material. In this study, samples of hazelnut shells, tea bush, and hazelnut knot selected as waste biomass were from the cities of Trabzon and Rize in the Eastern Black Sea Region. Firstly, the waste biomass samples were granulated into four different particle sizes by milling and sieving operations. Fast pyrolysis of the samples with specific mixing rates was carried out in a fixed bed reactor. Additionally, 2 wt% vanadium (V) oxide (V2O5) was used as catalyst to maximize the yield of pyrolysis liquid products. The influence of temperature, heating rate, and particle size on fast pyrolysis yields under both catalytic and noncatalytic conditions were investigated and compared. While the amount of liquid product increased with the addition of catalyst, the amount of solid products decreased. It has been found that the temperature and heating rate parameters are very effective in liquid product yield. In all experiments, the maximum liquid yield was acquired at the same heating rate of 450°C min−1 and the temperature of 450°C with particle size of 0.5 to 1.0 mm. The maximum pyrolysis liquid (bio‐oil) was obtained with catalytic pyrolysis, and this value was 60.58 wt%.

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An in situ reduction approach for bio-oil hydroprocessing

Cited by 56 publications

References 35 publications

An Overview on Catalytic Hydrodeoxygenation of Pyrolysis Oil and Its Model Compounds

An Overview on Catalytic Hydrodeoxygenation of Pyrolysis Oil and Its Model Compounds

Catalytic Fast Pyrolysis: A Review

Comparison of catalytic and noncatalytic pyrolysis and product yields of some waste biomass species

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